基于矩阵变换的稀布阵测向分析

The Thinned Array DOA Estimation Based on Matrix Change Research

在许多工程应用中,天线阵列要求有窄的扫描波束,而不要求有相应的增益,因此可以采用稀疏阵列。阵列如果周期性变稀会使方向图出现非常高的副瓣,这可以通过破坏非周期的方法加以控制。提出利用高斯随机分布的密度函数设置稀疏阵列,在稀疏阵列得到的协方差矩阵经扩展后,增益有了明显的提高。比较了该阵列扩展前和扩展后的测向性能,分析了阵列在不同稀疏比下的测向性能以及波束图,可以看出稀疏阵列的波束图的旁瓣明显降低了。

In practieal projects, the antenna array is only needed to have narrow scan beam, but not need the corresponding plus. So we can use thinned array to solve these problems. This paper points out that we can use the density function of the Gaussian distribution to set a thinned array,extending the covariance matrix will advance the gain clearly. This paper compares the expanded to the unexpanded in the performance of direction of arrival estimation at first,and then analyses the beam of different thinned ratio.